Modelo 303: Quarterly VAT Guide

Q2 2026: Modelo 303 is due by July 20, 2026. See the July tax deadlines guide and the Q2 quarterly return guide.

Modelo 303 is the quarterly IVA (Value Added Tax) self-assessment that all autónomos and businesses in Spain must file with the Agencia Tributaria (AEAT). Together with Modelo 130 for income tax, it is one of the most important tax obligations in the fiscal calendar of any autónomo.

What is Modelo 303?

Modelo 303 is the quarterly IVA self-assessment through which you declare to the AEAT the difference between the IVA you charged your clients (IVA repercutido) and the IVA you paid on your professional purchases and expenses (IVA soportado). Depending on the result, you either remit the difference to Hacienda or carry the balance forward to future quarters.

It is the most widely used tax form in the Spanish tax system: millions of autónomos and businesses file it every quarter through the Sede Electrónica de la Agencia Tributaria.

Who must file Modelo 303

The following must file Modelo 303 with the AEAT:

• Autónomos performing IVA-taxable activities
• Companies and commercial entities
• Professionals who charge IVA to their clients

Exceptions: IVA-exempt professionals (who do not file Modelo 303) include healthcare workers, teachers, and certain financial and insurance activities (Article 20 of the IVA Act). Autónomos in the Canary Islands file Modelo 420 (IGIC) instead.

Filing deadlines for Modelo 303

Modelo 303 is filed quarterly with the Agencia Tributaria during the first 20 days of the month following the quarter's end:

• Q1 (January-March): April 1-20
• Q2 (April-June): July 1-20
• Q3 (July-September): October 1-20
• Q4 (October-December): January 1-30

If the last day falls on a weekend or public holiday, the deadline extends to the next business day. Check the exact dates in our fiscal calendar for autónomos.

If you choose domiciliación bancaria (automatic bank debit), the filing deadline is 5 days earlier (the 15th for Q1-Q3, January 25 for Q4).

How IVA is calculated on Modelo 303

The basic formula for Modelo 303 is:

IVA to pay = IVA repercutido − IVA soportado

• IVA repercutido: the IVA you charge clients on your sales invoices
• IVA soportado: the IVA you pay on your purchases and deductible expenses

If the result is positive, you must remit that amount to Hacienda. If negative, you can carry it forward to future quarters or request a refund in the Q4 declaration.

Worked example for Modelo 303

Imagine you are a freelance graphic designer (autónomo in estimación directa). In Q1 2026:

Invoices issued (IVA repercutido):

Description	Taxable base	IVA (21%)
Web design, client A	€2,000	€420
Branding, client B	€1,500	€315
Packaging design, client C	€800	€168
Total repercutido	€4,300	€903

Invoices received (IVA soportado):

Description	Taxable base	IVA (21%)
Adobe Creative licence	€150	€31.50
Co-working space	€300	€63
New laptop	€1,200	€252
Total soportado	€1,650	€346.50

Modelo 303 result: €903 (repercutido) − €346.50 (soportado) = €556.50 to pay

That €556.50 is the amount you would remit to the AEAT when filing Modelo 303 for Q1.

Applicable IVA rates

Spain has three IVA rates that must be correctly reflected on Modelo 303:

IVA rate	Percentage	Examples
Standard	21%	Professional services, electronics, clothing
Reduced	10%	Food, transport, hospitality, new housing
Super-reduced	4%	Bread, milk, eggs, books, medicines

Most autónomos work with the standard rate of 21%.

Deductible expenses for IVA

You can deduct IVA soportado on expenses directly related to your professional activity:

• Office supplies and materials
• Computer equipment and software
• Professional services (accountants, lawyers)
• Phone and internet (business proportion)
• Commercial property rental
• Vehicle (50% deductible unless transport is your core activity)
• Training related to your profession

Important: You need complete invoices with all fiscal data (issuer's NIF, taxable base, IVA rate and amount) to deduct IVA. Simplified receipts are not valid for deduction.

How to file Modelo 303 on the AEAT Sede Electrónica

Modelo 303 is filed exclusively online. Follow these steps:

1. Access the Sede Electrónica at the Agencia Tributaria using a digital certificate, electronic DNI, or Cl@ve PIN.
2. Find Modelo 303 under "Impuestos y tasas" > "IVA" > "Modelo 303".
3. Select the tax year and period (quarter) you are declaring.
4. Fill in the boxes: enter taxable bases and IVA repercutido amounts (boxes 01-09) and deductible IVA soportado (boxes 28 and following).
5. Review the result (box 69): positive (to pay) or negative (to offset/refund).
6. Choose payment method: domiciliación bancaria, NRC payment code, or bank deposit.
7. Sign and submit the declaration. Save the PDF receipt with the CSV validation code.

Tip: Have your issued and received invoice records ready before starting. If you use invoicing software, many can generate a draft Modelo 303 automatically.

Late filing penalties for Modelo 303

If you miss the Modelo 303 deadline, the consequences depend on whether you file voluntarily or after a formal notice from the Agencia Tributaria:

Voluntary late filing (without a formal notice)

If the result is positive (amount to pay), a surcharge applies under Art. 27 of the Ley General Tributaria, with no penalty:

Delay	Surcharge	Penalty
Up to 12 months	1% + 1% per full month of delay	None
Over 12 months	15% + late-payment interest	None

For example, filing 3 months late means a 4% surcharge (1% base + 3% additional).

If the result is negative or zero, the penalty is a fixed €100 (Art. 198.2 LGT).

Filing after a formal notice from Hacienda

If the AEAT sends a formal notice before you file, penalties apply under Art. 191 of the LGT:

Severity	Condition	Penalty
Minor (leve)	Amount ≤ €3,000, no concealment	50% of the amount owed
Serious (grave)	Amount > €3,000 or concealment	50%-100%
Very serious (muy grave)	Fraudulent means	100%-150%

If the result was negative, the fixed penalty is €200 (Art. 198.1 LGT).

Common mistakes to avoid

• Forgetting to include invoices received at quarter's end
• Not keeping copies of deducted invoices for 4 years
• Confusing invoice dates with payment dates
• Deducting IVA on expenses unrelated to your activity
• Not declaring intra-EU operations on Modelo 349
• Filing late without being aware of the surcharges

Related AEAT tax forms

Modelo 303 is not the only IVA obligation. These are the related forms:

• Modelo 390: annual IVA summary that consolidates all four quarterly Modelo 303 filings for the year. Due by January 30.
• Modelo 349: declaration of intra-EU operations. Required if you invoice or purchase from businesses in other EU countries.
• Modelo 130: quarterly income tax payment (estimación directa). Filed alongside Modelo 303 each quarter.
• Modelo 420: the Canary Islands equivalent of Modelo 303, for IGIC.

Related guides

• Fiscal calendar for autónomos — all key dates for the tax year
• Tax obligations for autónomos — complete guide to all tax forms
• Modelo 130: Income tax (estimación directa) — filed alongside Modelo 303 each quarter
• Modelo 390: Annual IVA summary — required with Q4 Modelo 303
• Modelo 349: Intra-EU operations — if you invoice clients in other EU countries
• Modelo 420: IGIC in the Canary Islands — the IVA alternative in the Canary Islands
• Cuota de autónomos — your monthly Social Security contribution
• IVA for autónomos: complete guide — everything about IVA: rates, exemptions, reverse charge, and recargo de equivalencia
• Tax optimization for autónomos — legal strategies to reduce your tax burden
• IVA with foreign clients: the definitive guide for autónomos invoicing outside Spain — when to charge IVA, when not to, and how to handle reverse charge with EU and non-EU clients
• How to invoice on Upwork, Deel, and Stripe as an autónomo in Spain — who is your client for IVA purposes and how to report platform income on Modelo 303